<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>图标</title>
    <!--引入必须的资源文件-->
    <link rel="stylesheet" href="../css/bootstrap.css">
    <script type="text/javascript" src="../js/jquery-3.3.1.js"></script>
    <script type="text/javascript" src="../js/bootstrap.js"></script>
</head>
<body>
    <span class="glyphicon glyphicon-user"></span>
    <button class="btn danger">
        <span class="glyphicon glyphicon-user"></span>
    </button>

    <button type="button" class="btn btn-default" aria-label="xxxx">
        <span class="glyphicon glyphicon-align-left" aria-hidden="true"></span>
    </button>

    <button type="button" class="btn btn-default btn-lg">
        <span class="glyphicon glyphicon-star" aria-hidden="true"></span> Star
    </button>
</body>
</html>